一次连续性大到暴雨成因及雷达回波特征分析

Contributing Factors and Radar Echo Characters of a Continuous Heavy Rain

利用T213资料、自动站每小时降水资料、探空资料、乌鲁木齐多普勒天气雷达资料等对乌鲁木齐地区2004年7月18～20日的连续性大-暴雨天气过程进行了分析,指出:局地强垂直风切变、高K指数、水汽输送、边界层偏西急流和不稳定大气层结对大降水的产生和维持具有一定的预报能力。

A continuous heavy rain over Urumqi was analysed based on the data of T213,precipitation of automatic observation,radiosonde observation,and dopplar weather radar.Results show that：strong vertical wind shear,higher K index,and plentiful water vapor transportation in local area,boundary layer jetstream and instability atmospheric stratification are favorable for the heavy rain.